Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Oct. 17, 2011 Convertible Notes Due 2016	Dec. 31, 2010 Mortgage Financing
Summary of Significant Accounting Policies
Period for reclassification of operating results of Medicomp, Inc.		2 years
Fair Value of Financial Instruments
Convertible Senior Notes, stated percentage			1.00%
Value of mortgage loan				$ 70,000,000
Inventories:
Raw materials	13,603,000	9,171,000
Work-in-progress	11,708,000	14,222,000
Finished goods	11,943,000	22,588,000
Total inventories	37,254,000	45,981,000
Increase in reserves for obsolescence	$ 8,900,000